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Methodology for optimization of an irrigation system with storage reservoirs. OWRT matching grant project B-041-IDA Item Info

A procedure was developed to specify optimal plans for an irrigation system with temporary internal storage. The procedure was used to develop plans for 1865 ha using farm service reservoirs. Daily potential and actual evapotranspiration for 25 years were computed. Probability distributions of patential and actual evapotranspiration for 1-30 days duration were estimated. A log-normal probability distribution was found to best fit the data, and probability equations for different durations were computed. These distributions were used to determine possible irrigation intervals for different crops growing in different soil types. Costs of different types of irrigation subsystem cornponents were computed including canal sections, farm service reservoirs, pumps, and sprinkler and gravity application subsystems. A marginal cost and benefit analysis was used to select the best irrigation intervals for all soil-crop cornbinations. The time of occurrence of maximum evapotranspiration for each crop was analyzed and found to follow a log-normal distribution. The peak water requirement of each crop was Xlll computed to determine the peak water requirement of each subunit within the study area. Water-use information was used to compute the volume of interval storage needed within the system. Fifteen farm service reservoirs were located at 15 specified sites by considering physical conditions and other restrictions. Costs and design capacities of farm service reservoirs and canal sections of the system were computed. By utilizing a mixed integer programming model, the locations of farm service reservoirs were optimized; and seven of the original 15 farm service reservoir sites were selected. A linear programming model was then used to compute the optimum capacity of each farm service reservoir, and parametric programming was used to examine the effects of varying water costs of system configuration. The cost and design capacity of the irrigation system with seven farm service reservoirs was computed. The total cost was 32% less than the cost of the irrigation system with the 15 original proposed farm service reservoirs.

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Title:
Methodology for optimization of an irrigation system with storage reservoirs. OWRT matching grant project B-041-IDA
Authors:
Khanjani, Mohammad Javad
Date Created (ISO Standard):
1980-08
Description:
A procedure was developed to specify optimal plans for an irrigation system with temporary internal storage. The procedure was used to develop plans for 1865 ha using farm service reservoirs. Daily potential and actual evapotranspiration for 25 years were computed. Probability distributions of patential and actual evapotranspiration for 1-30 days duration were estimated. A log-normal probability distribution was found to best fit the data, and probability equations for different durations were computed. These distributions were used to determine possible irrigation intervals for different crops growing in different soil types. Costs of different types of irrigation subsystem cornponents were computed including canal sections, farm service reservoirs, pumps, and sprinkler and gravity application subsystems. A marginal cost and benefit analysis was used to select the best irrigation intervals for all soil-crop cornbinations. The time of occurrence of maximum evapotranspiration for each crop was analyzed and found to follow a log-normal distribution. The peak water requirement of each crop was Xlll computed to determine the peak water requirement of each subunit within the study area. Water-use information was used to compute the volume of interval storage needed within the system. Fifteen farm service reservoirs were located at 15 specified sites by considering physical conditions and other restrictions. Costs and design capacities of farm service reservoirs and canal sections of the system were computed. By utilizing a mixed integer programming model, the locations of farm service reservoirs were optimized; and seven of the original 15 farm service reservoir sites were selected. A linear programming model was then used to compute the optimum capacity of each farm service reservoir, and parametric programming was used to examine the effects of varying water costs of system configuration. The cost and design capacity of the irrigation system with seven farm service reservoirs was computed. The total cost was 32% less than the cost of the irrigation system with the 15 original proposed farm service reservoirs.
Subjects:
irrigation efficiency irrigation systems economic efficiency
Collection:
IWRRI
Series:
Water for Idaho
IWRRI number:
198013
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
Publisher:
University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
wbv
Date Digitized:
2012

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Preferred Citation:
"Methodology for optimization of an irrigation system with storage reservoirs. OWRT matching grant project B-041-IDA", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-198013.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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